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Definition of infantile : Of or pertaining to infancy, or to an infant; similar to, or characteristic of, an infant; childish; as, infantile behavior.

Synonyms:

naive, acute, full-fledged, benign, autoimmune, chronic, kiddish, communicable, congenital, fully-grown, puerile, babyish, asymptomatic, fully-fledged, cherubic, catching, infantine, advanced, developed, full-grown, grown, growth, youth, full-blown, jejune, clinical, childlike

foremost, incipient, hatching, maiden, fetal, commencing, initial, early, dawned, preparatory, formative, first, beginning, nascent, primal, primeval, Genesis, introductory, aboriginal, germinal, alpha, newborn, new, original, precursory, inaugural, preliminary, embryonic, sprouting, primordial, budding, emerging, infant, starting, baby

immature, childish, juvenile, young, youthful, adolescent

Usage examples:

• This confusion is common in infantile speech, e. - "The Romance of Names", Ernest Weekley.
• She gave him a demure glance under her infantile lashes. - "Kildares of Storm", Eleanor Mercein Kelly.
• They were fitted for the new reading public for this reason; the constant repetition of the same characters, events, scenes, plots, gave their infantile minds the pleasure which children find in having a story told over and over in exactly the same terms. - "Imaginary Interviews", W. D. Howells.